Stand for portable electric drills



Aug; 13 i v E. J. FOSSHEIM r 2,802,330

- j STAND FOR PORTABLE ELECTRIC DRILLS Filed Sept. 9, 1955 at-gag I 2 56 60 .54 /0 I v o 2z INVENTOR.

'ArraLe/v Ys" gar/G2 gwwfw STAND FOR PORTABLE ELECTRIC DRILLS Elmer James Fossheim, Edson, Alberta, Canada Application September 9, 1955, SerialNo. 533,358

2 Claims. (Cl. 77--55) This invention relates to an improved adjustable stand for portable electric drills, in such. a manner as to facilitate the drilling of holes at particular, selected angles.

The main object of the present invention is to provide a generally improved drill stand which: includes means for holding a drill at selected angles to the work, and means for predetermining the depth of penetration of the drill bit in the work.

Another object of the invention is to provide a drill stand which. permits a component of the stand to remain attached to a drill even when the drill is: detached from the remainder of the stand, which component offers no interference with use of the drill apart from thestand.

Another object of the invention is to provide a drill stand of the character indicated above of rugged and serviceable form which can be manufactured at low cost, and is usable with any conventional portable electric drill without requiring bolting or securing of the drills to the stand.

Other objects will appear from the following description, the claims appended thereto, and from the annexed drawing, in which like reference characters designate like parts throughout the several views, and wherein:

Figure 1 is a side elevational view of a drill stand according to the present invention, showing a portable electric drill mounted thereon;

Figure 2 is a front end view on line 2-2 of Figure 1;

Figure 3 is a horizontal sectional view on line 3--3 of Figure 1; and

Figure 4 is a horizontal sectional view taken substantially on line 4-4 of Figure 1.

Referring in detail to the drawings the numeral 10 generally designates a conventional portable electric drill having a cylindrical casing 11, and an oifset chuck 13 at one end holding a drill bit 15.

The illustrated drill stand 12 comprises an open flat oval base 14, having in the upper side of its rear end portion a shallow recess 16, and having in its front end portion a relatively narrow slot 18, at opposite sides of which there are formed shallow recesses in the upper side of the base. The recesses in the end portions of the base, and the provision of the opening 18, are for the purpose of permitting any of various small work pieces, lengths of pipe, or oddly shaped work pieces to be supported upon the base in longitudinal alignment with the drill 10.

Secured to the underside of the base is a strip 21 of anti-skid material, so that the base will be held against slippage on a support surface S.

Upstanding from opposite sides of the base are inverted Y-shaped standards 22, including downwardly divergent legs 24 having outwardly turned feet 26 at their lower extremities secured as indicated at 23 to the longitudinal side portions 21 of the base. Upper end portions of the standards are inwardly curved, as indicated at 30 (Figure 2) and terminate in upstanding cars 32 laterally spaced apart a substantial distance. The ears 32 are formed with transversely aligned openings, and extendnited States Patent 2 ing through said openings is a pivot headed bolt 34, on whose shank is threaded a lock nut 36 formed with a radially, outwardly projecting handle 38.

The ear 32 on one of the standards has thereon a fixed forwardly projecting horizontal pointer 40 which traverses a vertical segmental protractor plate 42 having an arcuate scale 42 at its forward edge, marked from. 0 to degrees. The protractor plate has an opening. centered with respect to the scale 43 which receives. the pivot 34- for pivotal adjustment of the protractor plate relative to the pointer 40.

It will thus be seen that? by loosening the nut. 36, the protractor plate 42 can be adjusted about the pivot bolt 34, to register the pointer 40 with a selected degree marking of the scale 44, thus, in a manner to be made presently apparent, tilting the drill to a corresponding angle ofinclination relative to the base 14.

An elongated, straight. channel member 54 is formed with downwardly and inwardly turned spaced guide flanges 55 for the full length thereof, defining a trackway opening downwardly. Front and rear T-shaped slides 50 and 52 are slidably confined in the trackway and are preferably integrally connected to the opposite ends of an elongated rectangular slide plate 56 (Figures 2 and 4) slidably confined in the trackway. Fixed to and depending:

from theslides 50 and 52 are front and rear split ring clamps 46 and 48, arranged to be severally clamped about the reduced forward end portion 45 of the drill casing 11 and about the drill casing thereof, whereby the drill 10 is mounted on the stand 10 for forward and rearward movement along the channel 54.

The lower edge of the protractor plate 42 is integrally or otherwise rigidly connected to the top surface of the guide channel 54 so that with the nut 36 loosened, when the protractor plate is pivoted about the bolt 34 to a selected position of adjustment, the guide channel 54, and hence the drill 10, will be correspondingly adjusted, so that the drill bit 15 is disposed at a selected angle to the horizontal, corresponding to the location of the pointer 40 on the scale 44.

Secured to the drill casing 11 adjacent the rear end thereof is a small clamp 58 for stabilizing the rear end of the drill during feeding of the drill into the work, said clamp 58 being secured to the rear extremity of the slide plate 56. The clamp 58 can be provided with an index, and the adjacent side edge of the guide channel 54 provided with a longitudinal scale calibrated in inches and fractions of inches. As a result, if for example a hole of a depth of two inches is to be drilled in the work, the index would be positioned at a starting position of 0 inches on the scale, after which the drill bit 15 would be fed into the work for a distance of two inches until the index arrived at the two-inch marking on the scale on the guide channel. It is to be understood, in this connection, that in the starting position of the drill, the tip of the bit 15 would be at the face of the work.

The index marking has been shown at 60 in Figure 1, and While the depth scale on the guide channel 54 is not shown, it could be readily provided in the manufacture of the stand 20.

An upwardly bowed leaf spring 62 is anchored at one end to the slide plate 56, and overlies the slide plate, as shown in Figure 4, and has its crest portion bearing against the underside of the web of the guide channel 54, so as to inhibit wanton movement of the drill along the channel, thereby placing the drill under greater control by the user as it is fed into the work.

The leaf spring 62 underlies a block 64, secured to the top of the web of the guide channel 54. Threaded vertically through said block 64 is a clamping screw 66. Whenever it is desired to hold the drill completely stationary on the channel 54, the screw 66 is turned down upon the spring, flattening the spring upon the slide plate 56 and frictionally engaging the slide plate 56 upon the flanges 55, thereby clamping the drill against movement longitudinally of the guide channel 54. I

By reason of the construction illustrated and described, thedrill it) can be swiftly removedentirelyfrom the stand 12, with the slide'plate 56 remaining attached to the drill and sliding out of either end of the guide channel 54. The presence of the slide plate 56 or the drill does not interfere with normal use of the drill, and the drill can be manually grasped and used for drilling not requiring accurate positioning thereof, in a usual manner.

It is'belie'ved apparent that the invention is not necessarily confined to the specific use or uses thereof described above, since it may be utilized for any purpose to which it may be suited. Nor is the invention to be necessarily limited to the specific construction illustrated and described, since such construction is only intended to be illustrative of the principles, it being considered that the invention eomprehends any minor change in construction thatrnay be permitted within the scope of the appended claims.

What is claimed is:

i. In a stand for a portable electric drill, a base having laterally spaced longitudinal side portions, standards fixed to and rising from said side portions, said standards having inwardly directed upper end portions terminating in upstanding laterally spaced ears, a pivot bolt having a shank traversing said ears, said shank having a head bearing against the outer side of an ear, a locking nut threaded on the shank and bearing against the outer side of the other ear, a vertical protractor plate traversed by and pivotally mounted on said shank between said ears, said protractor plate having a lower edge, an elongated straight inverted guide channel having laterally spaced flanges and a web, said web being fixed to and along the lower edge of the protractor plate, said protractor plate having an arcuate forward edge, a scale on one side of said tractor plate along the arcuate forward edge, a pointer fixed on and projecting forwardly from one of said ears alongside of said side of the tractor plate, and front and rear drill clamps depending from said guide channel and having slides slidably confined in said guide channel.

2. A drill stand according to claim 1 wherein a slide plate is slidably confined in said guide channel and is secured to at least one of said clamp slides, a longitudinally bowed leaf spring interposed between said slide plate and the guide channel web and secured at one end to said slide plate and frictionally holding the slide plate against wanton movement along the guide channel, an element on said web, and a vertical clamping screw threaded through said element having a lower end bearing upon said leaf spring, said screw being arranged to be threaded downwardly to comprise the spring on the slide plate and frictionally engage the slide plate with the guide chan-- Dartt Dec. 12, 1916 Weiss Mar. 16, 1920 

